Security readout for executives and security teams
Plain-English summary
RustDesk Client through 1.4.8 can expose user passwords to offline guessing if a client authenticates through a rogue or on-path API/relay server. The issue is not simple replay; it is weak password-proof design. No provided source confirms active exploitation or a named patch.
Executive priority
Treat as a moderate-priority credential exposure risk. Prioritize environments using RustDesk for administrative access, custom relay infrastructure, or shared passwords. Escalate if related server-positioning CVEs are present.
Technical view
The login proof uses SHA256(SHA256(password + server salt) + server challenge). Because salt and challenge are server-controlled and the hash is fast, a malicious or on-path server can capture a proof and attempt offline password recovery. CVE text says online rate limits do not address this.
Likely exposure
Exposure applies to RustDesk Client on Windows, macOS, Linux, iOS, and Android through 1.4.8, especially where clients use untrusted, compromised, or intercepted API/relay infrastructure.
Exploitation context
The source bundle marks KEV as false. It references a third-party advisory tagged exploit, but provides no confirmed active exploitation. Practical abuse requires a rogue or on-path server position and depends heavily on password strength.
Researcher notes
The capture-replay claim was withdrawn because challenges change per connection. The remaining issue is CWE-916: insufficient computational effort in a server-controlled challenge design. Evidence does not name a patch, so remediation should track vendor guidance.
Mitigation direction
- Check RustDesk vendor guidance for fixed versions or official remediation.
- Avoid untrusted or unexpected RustDesk API and relay servers.
- Rotate RustDesk passwords after suspected rogue-server exposure.
- Use strong, unique passwords to reduce offline guessing success.
- Review related server-positioning risks in CVE-2026-30794 and CVE-2026-30797.
Validation and detection
- Inventory RustDesk Client versions and identify deployments through 1.4.8.
- Review client configuration for custom or unexpected server settings.
- Confirm whether endpoints could have used untrusted relay/API infrastructure.
- Check vendor advisories for patch status before closure.
- Assess whether exposed passwords were reused elsewhere.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-916: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-30789 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——VULSecVulnerability scoring details
Base CVSS 4.0 score
5.7MediumVector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://rustdesk.com/docs/en/client/CVE reference, VULSec · technical-description, x_--config documentation
- https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pubCVE reference, VULSec · third-party-advisory, exploit
- https://www.vulsec.org/CVE reference, VULSec · vdb-entry, third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of Password Hash With Insufficient Computational Effort
Use of Password Hash With Insufficient Computational Effort represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.